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A kind of preparation method of superfine zinc oxide powder

A technology of zinc oxide powder and zinc oxide, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of large equipment investment, inconvenient source, inconvenient operation, etc., and achieve Uniform particle size distribution, less impurities, and controllable particle size

Active Publication Date: 2017-12-22
NANJING HUASHI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages and disadvantages of this method are obvious. The advantage is that it will not introduce impurity ions, the product has high purity, and more importantly, it avoids the environmental pressure brought by the washing process; the disadvantage is that it needs to be carried out under higher pressure, and equipment investment Large, inconvenient operation, and carbon dioxide gas is used as raw material, high-purity carbon dioxide gas is not only inconvenient to source, but also needs to be compressed to feed
[0011] There are still many methods for preparing zinc oxide reported in research, such as solid phase grinding, microwave field radiation heating method, high frequency induction heating method, plasma heating method, electron beam heating method and laser heating method, sputtering method, supergravity method , microemulsion method, etc. These methods are generally inconvenient to operate, not suitable for large-scale industrial production, and only stay in the experimental stage

Method used

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  • A kind of preparation method of superfine zinc oxide powder
  • A kind of preparation method of superfine zinc oxide powder
  • A kind of preparation method of superfine zinc oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Slowly add 27.67 kg (340 moles) of coarse-grained zinc oxide powder into 242.86 liters of acetic acid solution with a concentration of 2.8 mol / L (containing 680 moles of acetic acid). The zinc oxide particles gradually and completely dissolve under stirring to become a transparent liquid, and then add 42.86 kg of Oxalic acid dihydrate (340 moles), a white precipitate was formed, and the precipitate cake and filtrate were obtained by filtration.

[0040] The precipitated filter cake was dried at 105°C to obtain a white powder. The dried white powder was calcined at 500-600° C. for 1.5 hours to obtain 27 kg of zinc oxide powder with an average particle diameter of 100 nanometers. Powder electron microscope photo see figure 2 .

[0041] Filtrate test acidity, add metered glacial acetic acid and water to form 242.86 liters of 2.8mol / L concentration acetic acid solution, repeat the above process to get an average particle diameter of 101 nanometers zinc oxide ultrafine pow...

Embodiment 2

[0043] 27.67 kg (340 moles) of coarse-grained zinc oxide powder was slowly added to 242.86 liters of benzoic acid solution with a concentration of 3.0 mol / L (containing 728.6 moles of benzoic acid), and the zinc oxide particles gradually and completely dissolved under stirring to become a transparent liquid, and then 42.86 Kg of dihydrate oxalic acid (340 moles), a white precipitate was generated, and filtered to obtain the precipitate and filtrate.

[0044] The precipitated filter cake was dried at 105°C to obtain a white powder. The dried white powder was calcined at a temperature of 500-600° C. for 2 hours to obtain 27.67 kg of zinc oxide superfine powder with an average particle diameter of 103 nanometers. Powder electron microscope photo see Figure 4 .

[0045] Filtrate test acidity, add the benzoic acid of metering and water to form 242.86 liters of 3.0mol / L concentration benzoic acid solution, repeat the above-mentioned process to get average particle diameter and be...

Embodiment 3

[0047] Slowly add 27.67 kg (340 moles) of coarse-grained zinc oxide powder into 242.86 liters of acetic acid solution with a concentration of 3.36 mol / L (containing 816 moles of acetic acid). The zinc oxide particles gradually dissolve completely under stirring and become a transparent liquid, and then add 38.57 kg of Oxalic acid dihydrate (306 moles), a white precipitate was formed, and the precipitate and filtrate were obtained by filtration.

[0048] The precipitated filter cake was dried at 105°C to obtain a white powder. The dried white powder was calcined at a temperature of 500-600° C. for 4 hours to obtain 27 kg of zinc oxide superfine powder with an average particle diameter of 85 nanometers. Powder electron microscope photo see Image 6 .

[0049] Filtrate test acidity, add metered acetic acid and water to form 242.86 liters of 2.8mol / L concentration acetic acid solution for mechanical application, repeat the above process to get an average particle diameter of 27 ...

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Abstract

A method for preparing superfine zinc oxide powder. Crude particle zinc oxide or metal zinc is used as a raw material; an organic acid zinc salt solution is generated by means of organic acid dissolution; oxalic acid is added to generate zinc oxalate sediment; filtering is carried out to obtain zinc oxalate solid and organic acid; organic acid is used as a raw material for dissolving the crude particle zinc oxide or metal zinc in the next batch; and the zinc oxalate is calcined to obtain uniform-particle zinc oxide powder. In the method, no waste liquid or waste solids are discharged in the preparation process, and the average particle size of particles of obtained zinc oxide powder ranges from 30 nm to 200 nm in average and can be adjusted by means of the raw material proportion.

Description

technical field [0001] The invention belongs to the field of preparation of superfine powder materials, and relates to a preparation method of environment-friendly superfine zinc oxide powder. Background technique [0002] Zinc oxide powder is a white powder with high refractive index, excellent thermal conductivity, antibacterial and anti-ultraviolet properties, and is widely used. In the fields of plastics, synthetic rubber, paint, paper, etc., zinc oxide is widely used as a covering agent and colorant, commonly known as zinc white; in sunscreens for cosmetics, zinc oxide is used as a sunscreen to block ultraviolet rays. Zinc oxide has excellent light-emitting properties at room temperature and is widely used in the field of semiconductors, such as liquid crystal displays, thin-film transistors, and light-emitting diodes. In the field of food and medicine, zinc oxide is used as a nutritional enhancer, antibacterial agent, and astringent. In the chemical industry, zinc ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02B82Y30/00
CPCB82Y30/00C01G9/02
Inventor 陈洪龄王小曼汪昌国李华山
Owner NANJING HUASHI NEW MATERIAL CO LTD
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